What did you do to your Sierra/Silvy today? - Page 4293 - Chevy and GMC Duramax Diesel Forum
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post #42921 of 43531 (permalink) Old 06-08-2019, 09:11 PM
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Washed it for the first time in over a year


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post #42922 of 43531 (permalink) Old 06-09-2019, 12:34 AM
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Just spent half an hour trying to get a Lego spider man head out of my passenger seat mechanism.
Kids 😝

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post #42923 of 43531 (permalink) Old 06-09-2019, 01:56 AM
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Full exterior detail today

Washed it
Clay barred areas.
Spent 2 hours on tar removal
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Put some tire dressing on and wiped the wheels down a final time.

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post #42924 of 43531 (permalink) Old 06-09-2019, 03:17 AM
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Quote:
Originally Posted by mizterwizard View Post
You don't need to bench bleed most master cylinders. Install it with the brake lines loose. Fill the reservoir. When bubbles stop coming out of the fittings, tighten them up.

Then go into the cab and depress the brake pedal about an inch many many times. Do this until bubbles stop appearing in the reservoir. That takes care of it in 99% of cases. If it doesn't then do the standard bleed with a helper depressing the pedal while you crack the bleeders.

A bit of effort to keep the brake lines from ingesting air goes a long way toward getting the brake pedal solid later.

As a final bleeding step you can compress the caliper pistons to push fluid back into the master cylinder and to push air out of the compensation ports in the reservoir.
Thanks, are there any check valves/springs in the MC that could keep pressure applied to the calipers after the brake pedal is released?

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post #42925 of 43531 (permalink) Old 06-09-2019, 03:29 AM
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The HB can. When you think pressure is being held, I'd remove the two nuts between the two units, see if the pressure is released.

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post #42926 of 43531 (permalink) Old 06-09-2019, 04:15 AM
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Quote:
Originally Posted by 07Dmaxx93 View Post
Washed it for the first time in over a year Sent from my iPhone using Tapatalk


Im curious, what took you so long?

2008 Silverado 2500HD CCSB LTZ Diesel
FASS 95 Lift Pump (with Baldwin filters), Edge Insight CTS Monitor on a Windshield Mount, Nicktane Fuel Filter Adapter w/ CAT 306-9199 UHE tertiary fuel filter, Bilstein 5100 Stock Height, MBRP Downpipe back 4" exhaust with muffler and FTE 30" resonator/muffler, Sinister EGR Delete, Tuned but wont say who did it, Bushwacker Bed Rail Caps, AMP Research Bedstep, Fumoto oil drain valve, Dorman PS Oil cooler, Pioneer AVIC 7200NEX GPS/Stereo, Air Lift LoadLifter 5000 Air Bags.
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post #42927 of 43531 (permalink) Old 06-09-2019, 04:28 AM
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Nothing is supposed to hold pressure in the system when the pedal is released.

With disks in front and drums in the back there is a valve that holds off a little pressure from the fronts until the wheel cylinders in back have overcome their return springs. This keeps the front wheels from sliding on ice when very little pressure is needed to lock the front brakes. Then the valve opens and fluid goes to both the front and rear. At a certain point pressure is withheld from the rear so that the weight transfer under braking doesn't make the rears slide but the front continues to build pressure. All disk systems don't have a hold off valve but many still have the pressure limiter for the rear calipers.

Once the wheels start to slide the ABS kicks in. It blocks all fluid flow to the sliding wheel and dumps it to an internal reservoir or to the inlet to an internal pump. This condition remains until that wheel comes back up to speed. If another slides in the mean time it also gets blocked. It is possible to have all of the wheels pressure to get dumped at once. This typically happens at low speed so there is a cut off speed, typically around 4 mph, below which the ABS quits working. This varies from one application to another. When the ABS dumps pressure it also starts up it's own pump and puts pressure back into the master cylinder. You can often feel this as a kick back in the brake pedal but some systems don't kick the pedal back. When the sliding wheel comes back up to speed, pressure from the master cylinder is again allowed into that brake circuit and it may lock again. It does this over and over until you either back off the brakes or traction improves.

Again, nothing holds pressure in the system when the pedal is released. The ABS can only function when the brake pedal switch shows that you are applying pressure. If you let off the pedal the ABS quits and everything is open from the calipers to the reservoir.
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post #42928 of 43531 (permalink) Old 06-09-2019, 05:14 AM
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Quote:
Originally Posted by 407driver View Post
Im curious, what took you so long?


It’s been broken and stuffed in the corner for the past year.


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post #42929 of 43531 (permalink) Old 06-09-2019, 05:58 AM
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Quote:
Originally Posted by 07Dmaxx93 View Post
It’s been broken and stuffed in the corner for the past year.


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I drive mine every day and Ive only washed it 4 times in 3 years 😂
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post #42930 of 43531 (permalink) Old 06-09-2019, 06:55 AM
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Quote:
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I drive mine every day and Ive only washed it 4 times in 3 years


Work truk


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S369SXE by WCFab
Fass 150GPH
XDP Sump



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